Book/Report

FZJ-2016-06915

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetische Neutronenstreuexperimente zum Relaxationsverhalten von Zwischenvalenten Seltene- Erd-Verbindungen

Holland-Moritz, E. (Corresponding author)FZJ*

1978
Kernforschungsanlage Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/13053

Report No.: Juel-Spez-0014

Abstract: Neutron scattering measurements with energy analysis were performed on the intermediate valence(IV) compounds CePd$_{3}$, CeSn$_{3}$, CeBe$_{13}$, CeCu$_{2}$Si$_{2}$, TmSe, and YbCu$_{2}$Si$_{2}$ for different scattering angles. The isostructural diamagnetic compounds with Lanthanum or Yttrium, instead of the rare earth, were used as reference samples with no 4f-shell. The paramagnetic compounds with Terbium or Holmium were measured as reference systems with a stable 4f-shell. The experimental results are: (a) Magnetic scattering which was consistent with a 4f-formfactor could clearly be detected for an IV-system. (b) The quasielastic magnetic scattering has an anomalously large line width (e.g. 20 meV for CePd$_{3}$ and 6 meV for YbCu$_{2}$Si$_{2}$) , which is nearly temperature independent. Below a certain temperature Tsp the line width r/2 becomes largerthan the thermal energy k$_{B}$T. Therefore it is now a fact that the anomalies in the static susceptibility of an IV-compound do not depend on some complicated magnetic structures or crystal-field singuletts. Because of the anomalously large line width these anomalies must be due to a very fast relaxation process. (c) The quasielastic line width of the paramagnetic reference compound is about two orders of magnetude smaller than those of the IV-compounds. (d) The scattering intensities are in accordance with a broken valence. These results are interpreted by a temperature independent quantummechanical valence-fluctuation.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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